Lathe-fixture for gear-cutting



(No Model.) 2 Sheets-Sheet-1;

BRANSTETTER. LATHE FIXTURE-FOR GEAR CUTTING.

No. 516,586. Patented Mar. 13, 1894.-

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(No Model.) 2 Sheets-Sheet,- 2.

. R. BRANSTETTER.

LATHE FIXTURE FOR GEAR CUTTING.

Patented Mar; 13, 1894,;

' T at whom it may concern:

UNITE TATES ATENT F-FlCEe RAPER BRANSTETTER, OF WIOHITA, KANSAS.

SPECIFICATION forming part of Letters Patent No. 516,586fdated March 13, 1894.

Application filed July 7, 1893. Serial No. 479,786. (No model.)

Be it known thatI, RAPER BRANSTETTER, a resident of Wichita, in the county of Sedgwick and State of Kansas, have invented certain new and useful Improvements in Lathe-Fixtures for-Gear-Outting; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Myinvention relates to an improvementin lathe fixtures for gear cutting,-the object of the invention being to provide simple and efficient means adapted to be applied to a lathe for cutting gear teethat any desired angle ,head stock B and a sliding and pivoted rest O are mounted. The blank from which the gear is to be made is placed on the end of the spindle D of thelathe and also placed on said spindle is a wheel E having, preferably, one hundred teeth. A frame F is removably connected to the bed B directly under the toothedwheel E by means of a pin a, which enters an enlargement a on the frame F, the head a of said pin being adapted to enter the groove a in the bed A. A screw-threaded rod a is also adapted to enter the frame F and is provided with a wheel a, by means of which to turn it. The screw rod a is made with a conical end 01 adapted to enter a similarly shaped socket a in the pin a, thus tending to force the bolt up and the frame down snug on the engine bed. The frame F carries a shaft F, said shaft being mounted in bearings in the ends of the frame, one of which bearings is elongated as shown in Fig. 6. The shaft F carries a worm F which meshes with the toothed Wheel E, said worm being maintained snugly in mesh with the toothed wheel E by means of a spring F adapted to hear at one end on the frame F and at the other end against the shaft F, and thus compensate for any inequalities there may be in the toothed wheel. A dial G is carried by the frameF at one end thereof, and in the center of this dial an opening a is made, through which the end of the shaft F projects without coming into contact with the dial, said shaft being pro- .vided at its end with a crank arm 12, havinga pointer 12'. A pointerc is mounted at a point between its ends on a hollow rivet c, slightly larger than the opening a said hollow rivet being adapted to enter the opening a around the shaft projecting through said opening. One end of the pointer c is adapted to project beyond the periphery of thedial G and is provided with a perforated enlargement 0 through which a segment or gage c concentrio with the dial G, passes. One end of the segment or gage c is provided with inwardly projecting lugs 0 0 adapted to embrace the periphery of the dial, the lug 0 serving as a pointer and the lug 0 serving as a guide. A thumb screw 0 is passed-through the enlargement 0 and is adapted to engage the segment 0 whereby to lock the segment and pointer and cause them to move together. The purpose of these parts will be hereinafter explained. The face of the dial G has a number of degrees marked thereon equal to the number of teeth on the wheel E, preferably one hundred.

On the sliding rest 0 of the lathe, a later- 7 ally adjustable carriage I is mounted, and on said laterally adjustable carriage, a longitudinally adjustable carriage J is mounted, said carriages being provided with the'usual screws 1, J, for adjusting them.

On the carriage J a clamp K is mounted and adapted to receive and hold, in any de sired position, a tool holder L. The tool holder L comprises a horizontal bar 1 adapted to be held by the clamp K, and a tubular sleeve 2. Through the sleeve 2 a spindle M is passed and has secured to it a cutter N. Said spindle M is also provided with a pulley M, to which motion will be imparted in any suitable manner. From this construction and arrangement of parts it will be seen that the cutter can be readily adjusted for any size of wheel to be cut,it can be adjusted to and from the Wheel being operated upon and can be adjusted at any angle desired so as to adapt it to cut any desired bevel teeth. It will also be seen that in order torotatethe spindle once it will be necessary to revolve the shaft F, one hundred times, so that in order to revolve the wheel being operated upon once, the crank b must be turned one hundred times. Suppose now that it is desired to out, say twenty-three teeth in the periphery of the blank on the spindle D. The pointer 12' will be made to register with 100 on the dial G, after which the first tooth will be cut in the blank. Then to get the required distance between pointer c and lugct to indicate the distance, the pointer 19' must turn in addition to the required number of complete revolutions, the index finger or pointerc is first placed at 100 and thelug 0 on thegage is moved onbeyond the 100 pointthe distance of'thirty-four and eighteen twenty third-s degrees The crank 12 willthen be revolvedifour timesand'stopped overlug c the distaucetraveled being four hundred andthirty-four and eighteen twenty-thirds degreeswhich is equivalentto one twenty-third of the numberof degrees which must-be passed in theformation of the twenty-three teetln When-the crank arm and pointer are thus broughtto a stand still, the next tooth will be out. Then :the pointer c is; moved to "the point where the pointer I) stopped. The operation of-revolving the crank 12 is thenrepeatedfthe pointer I) always being stopped at: the lug cafter having passed pointers the fourth time. By the provision of; the segment or gage c adapted to move with the pointer c, mistakesin-countingwill be efiectually prevented when cutting a-wheel where it requiresfractions of adegreew The pointer is set at 100.. and-the gage or segment a is made to point to the stopping number so i that it is onlynecessary to move the painter of the crank arm after cutting eachtootln- With myimprovements I can, very accu- 'rately, space each toothand can make any combination less than. ten. thousand:

My improvements are very simple in construction, easy to operate, accurate, and effectual in every respect, in the performance of their functions.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, 1 is-.-

1. In a lathe fixture for cutting gear teeth, the combination with ashaft adapted to carry the blank to, be operated upon," anda toothed wheel secured on said shaft, of a frame, a shaft revolubly supported in the frame, said shaft having a worm thereon, a spring secured to the frame and bearing upward upon the worm shaft, a'handl'eoncrank on the worm shaft ib'y means of which it is turned,isaid handle, or crank having a -pointer thereon, a dial,'apointer adapted to-turn on the-dial, and a gage adjustably connected 'wi-th'the pointer thereon,substantiallyasisetforth;

2. The-combinationwvith a shaft adapted to carry the blank to beoperated upon-thereon,

a toothed wheelya-worm -shaftoperating in connection with the toothed wheehand means for turning the la'tter ofa dial; a poiriterhaving pivotal connection with the dial whereby it may be set relative thereto, said pointer having a set screw therein, and WgtlgGyhitV- ing a pointer on one endtwhichstraddles the edge of the disk, said'gage'beingheld adjnstably connected with the pointerbymeans of the set screw, substant-ially as set-forth;

3 In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

RAPER .BRANSTETTER.

Witnesses:

EDWARD ViAIL, GHARLnsI-I. KEACH. 

